1: H2 / PtO2 / acetic acid / 3 h 2: (i) HCl, MeOH, CHCl3, (ii) /BRN= 506021/, FeCl3, ZnCl2, aq. EtOH, (iii) polyphosphoric acid View Scheme

1: K2CO3 / dimethylformamide / 48 h / 100 °C 2: H2 / PtO2 / acetic acid / 3 h 3: (i) HCl, MeOH, CHCl3, (ii) /BRN= 506021/, FeCl3, ZnCl2, aq. EtOH, (iii) polyphosphoric acid View Scheme

(i) HCl, MeOH, CHCl3, (ii) /BRN= 506021/, FeCl3, ZnCl2, aq. EtOH, (iii) polyphosphoric acid; Multistep reaction;